Ionization energy

• A volcano is a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor and gases are being or have been erupted from the earth crust.
• The term volcano comes from the name of the roman god of fire, vulcan.
• The volcano includes the surrounding cone of erupted material.
• A volcano is a vent or "chimney that connects molten rock (magma) from within the earth's crust to the Earth's surface.
• The crater is the cup-shaped top part of a volcano through which magma and other volcanic materials flow.
• The summit is the highest point of a volcano.
• A vent is an opening in the volcano from where the lava comes out.
• The base is the lowest part, bottom or supporting layer of volcano.
• The slope is the angle made by the lower flank of the volcano and the peak of the volcano.
• A magma chamber is a place in mantle (under the earth's crust) that stored magma.
• Magma is hot, molten rock forced up the central vent and eventually through the crater.
• Lava is hot, molten rock on the earth's surface.
• A sill is a horizontal crack within a volcano which holds hardened magma.
• A dike is a thick vertical crack within a volcano which holds hardened magma.
• A conduit, also known as central vent, is a path from magma chamber to crater.
• A side vent is a vent on the side of a volcano for escaping steam, gas and lava.
• Volcanoes can be classified according to PHIVOLCS system where the Philippine volcanoes can be classify, Some erupt regularly and others have not erupted in modern history.
• Scientists classify volcanoes as ACTIVE, INACTIVE or EXTINCT.
• According to PHIVOLCS, our country has more than a hundred volcanoes as of 2013, Twenty-three are active while the rest are inactive.
• Active volcanoes are those that have a record of eruption within the last 600 years or those that erupted 10,000 years ago based on analyses of their materials.
• The top 5 most active volcanoes in the Philippines are Makaturing, Bulusan, Kanlaon, Taal, and Mayon Volcano.
• Inactive volcanoes, on the other hand, are those that have not erupted for the last 10,000 years and their physical form is being changed by agents of weathering and erosion through formation of deep and long gullies.
• Mount St. Helens was considered to be dormant but erupted after long periods of inactivity.
• A volcano not known to have erupted within modern history is classified as an extinct volcano, They have been worn away almost to the level of their magma chamber.